SLTB005A

UG308: Thunderboard EFM8UB3 User s Guide The Thunderboard EFM8UB3 is a low cost, small form factor de- TARGET DEVICE velopment and evaluation platform for the EFM8 Universal Bee Microcontroller. EFM8 Universal Bee Microcontroller (EFM8UB31F40G-A-QFN24) The Thunderboard contains an EFM8UB3 MCU together with an on-board SEGGER J- Pipelined 8-bit C8051 core with 48 MHz Link debugger for easy debugging through the USB Micro-B debugging connector. All of maximum operating frequency the EFM8 I/Os are routed to breakout pads on the sides of the board making it easy to 40 kB flash memory and 3328 bytes RAM expand on the board features and evaluate the EFM8 Universal Bee s features with cus- USB feature set tom hardware. KIT FEATURES USB connectivity SEGGER J-Link on-board debugger Virtual COM port User RGB LED and pushbuttons 2.54 mm breakout pads to EFM8 Flat flexible cable connector for external Silicon Labspostage-stam sized boards Optional Mini-Simplicity connector for Advanced Energy Monitoring using external Silicon Labs debugger SOFTWARE SUPPORT Simplicity Studio silabs.com Building a more connected world. Rev. 1.0 Table of Contents 1. Introduction................................3 1.1 Kit Contents ..............................3 1.2 Getting Started .............................3 1.3 Kit Hardware Layout............................3 2. Electrical Specifications ...........................4 2.1 Absolute Maximum Ratings .........................4 3. Hardware.................................5 3.1 Block Diagram..............................5 3.2 Power Supply..............................6 3.2.1 Self-Powered Mode..........................6 3.2.2 Bus-Powered Mode..........................6 3.3 Universal Serial Bus............................7 3.4 Push Buttons and RGB LED.........................7 3.5 On-board Debugger............................8 3.6 EFM8 Reset ..............................8 3.7 Connectors...............................9 3.7.1 Breakout Pads ...........................10 3.7.2 Mini Simplicity Connector........................11 3.7.3 EFM8 USB Micro-B Connector......................11 3.7.4 Debug USB Micro-B Connector......................11 3.7.5 Flat Flexible Cable Connector ......................12 4. Debugging ............................... 13 4.1 On-board Debugger Considerations ......................13 4.2 Virtual COM Port.............................14 4.3 Mini Simplicity Connector..........................14 5. Kit Configuration and Upgrades ....................... 15 5.1 Firmware Upgrades............................15 6. Schematics, Assembly Drawings and BOM................... 16 7. Kit Revision History and Errata ....................... 17 7.1 Revision History.............................17 7.2 Errata ................................17 8. Board Revision History and Errata ...................... 18 8.1 Revision History.............................18 8.2 Errata ................................18 9. Document Revision History......................... 19 silabs.com Building a more connected world. Rev. 1.0 2